<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>像素</title>
    <style>
      .atguigu1 {
        width: 10cm;
        height: 100px;
        background-color: red;
        grid-area: auto;
      }
    </style>
  </head>
  <body>
    <div class="atguigu1"></div>
  </body>
</html>
